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Journal of Antimicrobial Chemotherapy (2002) 49, 197-200
© 2002 The British Society for Antimicrobial Chemotherapy

Brief report

Prediction of mecA-positive coagulase-negative staphylococci: assessment of different phenotypic methods, breakpoints, culture media and culture conditions

Tor Monsena,*, Hadi Abda, Kjell Leonardssonb, Helén Edebroa and Johan Wiströmc

a Department of Clinical Bacteriology, University Hospital of Umeå; b Department of Ecology and Environmental Science, University of Umeå; c Department of Infectious Diseases, University Hospital of Umeå, 90185 Umeå, Sweden

Sensitivity for the detection of mecA-positive coagulase-negative staphylococci (CNS) was evaluated for different breakpoints of resistance for oxacillin using three different susceptibility tests, either on Mueller–Hinton agar supplemented with 2% NaCl (MH-NaCl agar) or on paper disc method agar supplemented with 5% defibrinated blood (PDM-blood agar). The Etest, multipoint inoculation test and disc diffusion test showed comparable sensitivity (0.96, 0.96 and 0.95, respectively) using an oxacillin breakpoint of >= 0.5 mg/L or <= 17 mm for the disc test, after incubation at 35°C for 24 h on MH-NaCl agar. The sensitivity decreased for breakpoints >= 1 mg/L and when PDM-blood agar was used instead of MH-NaCl agar.

* Corresponding author. Tel: +46-90-7851226; Fax: +46-90-7853591; E-mail: tor.monsen{at}climi.umu.se


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